Geosynthetics can effectively reinforce and reinforce the soil, which has been widely used in various engineering construction. For example, geosynthetics can effectively reduce the lateral deformation of the slope in the treatment of high side slope; in the retaining wall structure, it can improve the stability of the retaining structure and reduce its lateral deformation; in the subgrade engineering of high-speed railway and expressway, geosynthetics can effectively improve the load borne by the reinforcement pile at the lower part of the subgrade, and at the same time, it can reduce the lateral deformation of the subgrade slope.
土工合成材料的加筋作用主要通过筋土界面的相互作用来实现。拉拔试验能够很好地反映土体的密实、剪切状态,再现筋土相互作用机制。玻纤土工格栅还能够提高加筋土的动剪切强度，且布置层数越多,动剪切强度越大。
The reinforcement effect of geosynthetics is mainly realized by the interaction of reinforcement soil interface. The pull-out test can well reflect the compaction and shear state of soil, and reappear the interaction mechanism of reinforcement and soil. Glass fiber geogrid can also improve the dynamic shear strength of reinforced soil, and the more layers are arranged, the greater the dynamic shear strength is.
不同竖向压力下拉拔力与拉拔位移关系可以看到:随着拉拔位移的增大,格栅拉拔力逐渐增大,且竖向压力越大,格栅拉拔力越大;但是随着拉拔位移的增大,无论填料.上部竖向压力为多大,格栅拉拔力都没有出现峰值。
The relationship between pull-out force and pull-out displacement under different vertical pressures can be seen as follows: with the increase of pull-out displacement, the pull-out force of grid increases gradually, and the larger the vertical pressure is, the greater the pull-out force of grid is; however, with the increase of pull-out displacement, no matter how much the vertical pressure of filler and upper part is, there is no peak value of pull-out force of grid.
不同竖向压力下格栅拉拔力与剪胀力随拉拔位移变化曲线,其中竖向压力是指玻纤土工格栅拉拔前由竖向加载系统所提供的竖向压力;剪胀力则是指玻纤土工格栅在拉拔过程中产生的土体竖向应力增量,即玻纤土工格栅拉拔过程中的竖向应力减去初始竖向压力。
The vertical pressure refers to the vertical pressure provided by the vertical loading system before the glass fiber geogrid is drawn; the shear expansion force refers to the vertical stress increment of the soil produced during the drawing process of the glass fiber geogrid, that is, the vertical stress minus the initial vertical pressure during the drawing process of the glass fiber geogrid.
随着拉拔端位移的增大,拉拔力持续增大。剪胀力在拉拔位移较小时较小且基本保持稳定不变,随着拉拔位移的继续增大,剪胀力持续增大,且增长趋势与拉拔力的增长趋势较为一致。土体在拉拔过程中剪胀趋势明显,这可能是格栅拉拔力没有出现峰值的原因。竖向压力越大,玻纤土工格栅拉拔位移对剪胀力的影响越小,玻纤土工格栅在拉拔过程中,剪胀力增幅(剪胀力与初始竖向压力的比值)越小。
With the increase of the displacement of the drawing end, the drawing force increases continuously. The shear expansion force is small and stable when the drawing displacement is small. As the drawing displacement continues to increase, the shear expansion force continues to increase, and the growth trend is consistent with that of the drawing force. In the process of drawing, the tendency of shear expansion is obvious, which may be the reason why there is no peak value of the grid drawing force. The larger the vertical pressure is, the smaller the influence of the displacement on the shear expansion force is. The smaller the increment of the shear expansion force (the ratio of the shear expansion force to the initial vertical pressure) is during the drawing process.
土体密实度对格栅拉拔力的影响较为明显,密实度越大，格栅拉拔力越大。在压实系数为0.97时，格栅拉拔力没能出现峰值,土体在玻纤土工格栅拉拔过程中,出现了明显的硬化现象;压实系数为0.91和0. 87的低密实度的情况下，土体在格栅拉拔过程中出现了微弱的硬化现象,但时不明显。
The influence of soil compactness on the pulling force of grid is obvious. The greater the compactness is, the greater the pulling force of grid is. When the compaction coefficient is 0.97, there is no peak value of the grid pulling force, and the soil has obvious hardening phenomenon in the process of glass fiber geogrid drawing; when the compaction coefficient is 0.91 and 0.87, there is weak hardening phenomenon in the process of grid drawing, but it is not obvious.
竖向压力和土体密实度对拉拔过程中的剪胀均有影响,但是土体是否出现剪胀趋势以及土体剪胀的程度主要取决于土体本身的密实度。同时也说明玻纤土工格栅在桩网结构路基中的加筋作用。不仅表现在对土的水平位移的限制上,也体现在玻纤土工格栅加筋使得格栅上方土应力的增强作用。
Both the vertical pressure and the soil compactness have an effect on the dilatancy in the process of drawing, but whether there is a trend of dilatancy and the degree of dilatancy mainly depends on the compactness of the soil itself. At the same time, it also shows the reinforcement effect of glass fiber geogrid in the pile net structure subgrade. It is not only reflected in the limitation of the horizontal displacement of the soil, but also in the reinforcement effect of the glass fiber geogrid on the earth stress above the grid.
当桩帽间的格栅发生弯曲变形时,其位移将传递到桩顶上方的格栅,桩顶上方的格栅受到拉拔作用。由拉拔试验得到的结论可知:若加筋垫层中填料的密实度较大,则格栅上方竖向应力的增加越大,因此综合分析加筋垫层中填料的密实度对格栅加筋作用效果的影响较为明显。
When the grids between pile caps are bent and deformed, their displacement will be transmitted to the grids above the pile top, and the grids above the pile top will be pulled out. According to the conclusion of the pull-out test, if the compactness of the filler in the reinforced cushion is large, the increase of the vertical stress above the grid will be larger. Therefore, the comprehensive analysis of the compactness of the filler in the reinforced cushion has obvious influence on the effect of the grid reinforcement.
玻纤土工格栅在高密实度的土体填料拉拔过程中,容易出现剪胀趋势,随着筋-土界面位移的发展,填土竖向应力增加,土体发生剪胀,土工格栅的加筋作用不仅体现在横向的加筋,也体现在竖向应力的增大。填料密实度越小，竖向压力越大,剪胀趋势越不明显;填料密实度较小时，随着拉拔的进行,土体几乎不发生剪胀,土体的密实度将直接影响玻纤土工格栅的加筋效果,在实际工程中,应严格控制填料的.密实度,才能更好地体现玻纤土工格栅的加筋作用。在格栅拉拔中,土体的剪胀,存在一临界位移,当格栅拉拔位移大于此临界位移时,土体的剪胀趋势会突然增大。
The glass fiber geogrid is prone to shear expansion in the process of drawing the high density soil filler. With the development of the displacement of the reinforcement soil interface, the vertical stress of the fill increases, and the shear expansion of the soil occurs. The reinforcement effect of the geogrid is not only reflected in the horizontal reinforcement, but also in the vertical stress. The smaller the compactness of the filler is, the greater the vertical pressure is, the less obvious the shear expansion trend is; the smaller the compactness of the filler is, with the progress of drawing, the soil almost does not have shear expansion, and the compactness of the soil will directly affect the reinforcement effect of the fiberglass geogrid. In the actual project, the compactness of the filler should be strictly controlled to better reflect the reinforcement effect of the fiberglass geogrid. In the process of grid drawing, there is a critical displacement of the soil. When the displacement of grid drawing is larger than this critical displacement, the trend of soil shear expansion will suddenly increase.
相信大家看完以上内容以后，应该也对玻纤土工格栅的拉拔特性有所了解了，希望会对大家有所帮助吧。
I believe that after reading the above content, you should also understand the drawing characteristics of fiberglass geogrid. I hope it will help you.
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